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11.As a rule,participatorsare required either to accept the challenge or donate some money to ALS patients in the"Ice Bucket Challenge"(require)

分析 一般说来,在冰桶挑战活动中,要求参与者或者接受挑战,或者为ALS患者捐款.

解答 答案是are required.本题考查一般现在时的被动语态,其构成是"am/is/are+过去分词";题干中缺少谓语动词,根据句意,participators(参与者)"被要求"或者接受挑战,或者捐款;故用被动语态;as a rule说明这是一般规则,故用一般现在时;因此答案是are required.

点评 本题是要求用所给动词的适当形式填空,解题时首先考虑句中需要的是谓语动词还是非谓语动词;其次,如果是谓语动词关注时态、语态和数的变化;如果是非谓语动词要联系非谓语的基本用法判断非谓语的形式.

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